You don't account for $subX at all.
my @list = qw(
.coop
.com.co
.com.mv
.com.fj
.com.sb
.com.nf
);
@list= sort {
my (undef,$sub1,$tld1)=split /\./,$a;
my (undef,$sub2,$tld2)= split /\./,$b;
warn "[$sub1].[$tld1] cmp [$sub2].[$tld2]\n";
$sub1 cmp $sub2 || $tld1 cmp $tld2
} @list;
print "$_\n" for @list;
__END__
.com.co
.com.fj
.com.mv
.com.nf
.com.sb
.coop
Update: Fixed a couple of problems after reading the comment from moritz.
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